Situation is that I have several (10+) preconfigured sessions in Putty and I need to save them should I need to change PC or reinstall it.
Sessions parameters are stored in Windows Registry under path:
To export settings to a file use command:
regedit /e <filename>.reg HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions
To import settings use command:
regedit /s <filename>.reg
Also, you might want to save PUTTY.RND, by default sitting in your home directory.